Dear members

I have recently restored the radio set Mullard MAS231. I am facing one problem in this set. The original volume control in the set as per the schematic is 500K type 49.500.11.0.( with switch). Since the volume control was defective and the original value not available I replaced it by the volume control 49.470.36.0 ( 650K + 200K) and I also fitted the original switch. When I turn the volume control to switch ON the set I get some volume as during switch ON the volume control moves some 15 degrees after the switch becomes ON thereby giving some volume. IT does not become zero. My question is that is the volume control 49.500.19.0 ( with switch) different from the volume control 49.470.36.0 ( without switch)? Is the difference only in the additional switch or the volume control itself is different? How I can solve this problem?

Regards
P.Rajan